Nut-lock.



PATENTBD APR. 5, 1904.

J. P. MOMAHON.

NUT LOCK. APPLICATION FILED JAN. 5, 1903.

N0 IODEL.

un e n am No. 756,269. Patented April 5, 1904.-

UNITED STATES, PATENT OFFICE.

JOSEPH VP.' MGMAHON, OF ROCHESTER, NEWl YORK, ASSIGNOR OF ONE-4 l O F ROCHESTER, NEW YORK;

NUT-LOCK.

' SPECIFICATIN-follming part-of Letters Patent No. 756,269, dated April 5, 1904.

'Application led January 5, 1903. Serial No. 137,856. (No model.)

To all whom tmf/ty concern.'

Be itknown that I, JOSEPH P. MoMAHoN, of Rochester, in the county of Monroe and State of Newv ork, have invented certain new and useful Improvements in N ut-Locks; and I do hereby declare the following to be afull, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the 1o reference-numerals marked thereon.

y present invention relates to threaded bolts and the nuts coperating therewith; and it has for .its object to provide a thread upon out of its original position.

tween the parts. Th

cessfuloperation of have shown one known as a These offset'portions form, 1n effect in the thread; but as th tool or instrument. zo To these and other ends the invention consists in cer ain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the speci- 5 ication.

into position.

tion of a bolt provided wlth a thread formed adjacent convolutions. thereon 1n accordance with my inventlon. vFlg.

hold th bolt. Fig. 3 is a. view volutions of the thread. In the d similar to Fig. 1, showing a different method of arranging the oiset portions in the thread. Similar reference-numerals in the several figures indicate similar parts. In illustrating my invention I have shown it applied to a bolt 1, provided with the usual thread upon either part, and in offsets 4 I provid Y and at its opposite extremity having the screwthread upon whl l able thereon relative to the head 2. Bolts provided with the usual spiral thread when subjected to vibration become loosened by having thenuts thereon move backwardly on the thread through constant jarring or the slight and imperceptible movements in the structure in which they are employed. To emedy this difficulty, I provide one of the members with a thread havingoffset portions therein which form shoulders adapted to strain rotated.

sition when the nut is .unscrewed tween th out being broken by a shearing action b ee particular style of .thread employed is not essential to the sucmy invention, although square thread," and in forming it upon the bolt I provideit at intervals with oiset portions 4,which slightly out of pitchwhen it is forcibly moved movement or :wave motion 1n the thread as the In order to securely l e nut in adjusted position upon the bolt, I provide the odset portions 4 in'adjacent conrawings I ave shown a few of the convolutions of the thread at the outer end of the bolt formed in the usual manner without the offsets therein, which enables the nut to be started evenly, thus obviating any liability of stripping the forming the e those in the first few succeeding convolutions graduated, as indicated at 4, 4b, and 4f, so" that the pointed advancing end of the thread on the nut gradually takes up the curves of the offset as thenut is hese graduated portions also operate to straighten the thread into its normal poas above descrlbed 1t 1s made of such a length that when the nut4 is in the operative or binding positlon each turn of its thread will lie beose on the bolt provided with an offor distort the thread upon the other member 5o Said member is moved lnto engagement therewith, and to this thread, in Which the offset 'portions 4 are arranged out of alinement, and in the present instance they extend spirally around the bolt,

` so thatthe thread in the nut will be distorted at various points, causing it to be` securely locked inwhatever position it may be adjusted. While I have employed a' single thread in the illustration and that a square-cut thread,

the invention is equally applicable to the usual V-shaped or -other varieties of thread and also Whether or not the bolt is provided with one or more threads.

I claim as my invention- 1. The .combination with a member provided With a continuous thread having portions ofset in the direction of its lead, of a cooperating member having 4threads thereon deeper than'those on the other member and capable ofV being distorted by the oiset portions in the coperating thread.

2. The combination with a member provided With a continuous thread having a plurality of oset portions, of a cooperating member having the thread of greater depth than that of the -other member adapted to be distorted by one or more of said offset portions.

3. The combination with a member provided With an' external thread which has plain convolutions at its extremity and above the latter is provided with a plurality of oiset portions, of a nut provided with a thread of greater depth than that of the externallythreaded member and adapted to coperate therewith and to engage the osetA portions and to be distorted thereby.

4. The combination with abolt member provided with an external thread having offset portions therein extending in the direction of its lead, of a nut adapted to engage the bolt having an internal thread cut deeper than the one on the bolt. l

5. In a nut-lock the combination with a bolt having a thread which extends around it in plain convolutions at its extremity and above the latter is provided with a plurality of oli'- set portions, said portions being graduated, of a nuthaving the thread adapted to engage the thread on the bolt and to be distorted thereby.

6. The combination with a bolt 1 having a thread provided with oiset portions 4 therein adjacent to each other in separate convolutions being arranged out of alinement, of a nut 3 having the thread 5 therein formed deeper than the thread on the bolt.

JOSEPH P. MCMAHON.

A Witnesses:

G. WILLARD Rien, ELIZABETH J. PERRY. 

